RU2629248C1 - Correction lens for examination of peripheral areas of vision field - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: corrective lens for examination of the peripheral areas of the vision field contains a lens in a mandrel. In addition, there is a housing for lens fixation, a mirror hood installed inside the housing coaxially with the lens and made in the form of a truncated pyramid whose side faces are flat mirrors facing the mirror surface inwardly, as well as a flap with a circular hole coaxial with the lens and the mirror hood.

EFFECT: increased reliability of the results of peripheral vision fields examination due to the possibility of examination of the peripheral areas of the vision field on existing perimeters and campimeters with myopia and hypermetropia correction.

4 cl, 1 dwg

Description

The invention relates to medicine, in particular to ophthalmology, in particular to perimeters and auxiliary devices for perimeters, expanding their functionality and increasing the reliability of the results of examination of patients with myopia and hyperopia with subjective detection of the presence of test light stimulus, and can be used for early diagnosis of pathologies the visual path, limiting the field of view of the human eye.

When examining the visual field in patients suffering from myopia (myopia) and farsightedness (hyperopia), correction (corrective) lenses are used that provide a clear vision of the fixation test object and accurate contrast projection of the light stimulus onto the retina, in accordance with the requirements of ISO 12866.99.

Most modern perimeters have a holder for correction lenses.

http://centrzrenie.ru/wp-content/uploads/2014/04/Octopus entire.ipg

hrrp: //ophthalmology-med.ru/catalog/perimetry/ap-5000c-detail.html

http://www.vidacom.ru/catalog/l/19/517.html

http://www.vidacom.ru/catalog/1/19/105.html

http://www.vidacom.ru/catalog/1/19/594.html

http://wvvw.kranex.ru/prod/ophtalmologv/perimetr/ap 1000 /

As correction lenses, either lenses from standard sets for selecting glasses are used, or lenses with which the manufacturer sets their perimeters with sets.

The disadvantage of the used lenses is that they work (correct vision) only in the range from 25 to 30 degrees, which is explained by the limited size of the lenses, that is, reliable examination is possible only in the central region of the field of view. Correction on the peripheral areas of the field of view is impossible.

In ophthalmic practice, computer campimetry is widely used, where a computer display (monitor) is used as a screen for presenting light stimuli.

It is carried out according to such methods and programs as campimetry in white noise (white-noise field campimetri, Tubingen Electronic Campimeter), humphrey-type campimetri (Protocol 30-2): Damato campimetry multifixation campimetry, “Eyepiece "," Campi "and others. http://zreni.ru/813-issledovanie-centralnogo-i-perifericheskogo-poley-zreniya.html

The disadvantage of computer campimetry (as well as campimetry in general) is the lack of the ability to examine peripheral areas of the field of view (this is due to the limited size of flat displays), not to mention the use of correction lenses.

As the closest analogue to the claimed technical solution, a lens from a standard set for testing eyesight (selection of glasses) http://www.maxmedtech.ru/probnei-linzi containing a correcting lens in a mandrel and a handle (for ease of manipulation) with it the value of diopters (focus).

The disadvantages of the analogue include the fact that its geometric parameters allow correction only when examining the central field of view, in the range from 25 to 30 degrees from the visual axis. This is due to the natural limitations associated with the size of the lens.

The technical result of the claimed invention is aimed at increasing the reliability of the results of examination of peripheral areas of the field of view due to the possibility of examining peripheral areas of the field of view on existing perimeters and campimeters with correction of myopia and hyperopia.

The specified technical result is achieved by the fact that the claimed correction lens for studying peripheral areas of the field of view contains a housing inside which a lens is mounted in a mandrel, a mirror hood, coaxial with a correction lens and made in the form of a truncated pyramid, the faces of which are flat mirrors facing the mirror surface inward; as well as a shield with a round hole coaxial with the lens and mirror hood.

The exact contrast projection of light stimuli onto the retina of the eye in the peripheral areas is ensured by correcting their images with the lens and presenting them not directly, but reflected from the specular lens hood, while covering the flap from direct eye stimulation, and a clear vision of the fixation point is carried out through a round hole in the flap and provided by the same lens.

The invention is illustrated by the drawing, which shows a variant of the optical scheme of the device and the path of the rays from the places of presentation of light stimuli to the eye.

The inventive correction lens for studying peripheral areas of the visual field contains a lens 1 in a mandrel mounted in the housing 2, inside of which there is also a flap 3, which covers part of the presentation of stimuli from the examined eye (for example, a perimeter demonstration screen or computer display), with a round hole, coaxial lens for observing the fixation object, and coaxial to it 4 mirror hood, providing stimulation of the eye from light stimuli presented on the patient's invisible (behind the shield) eye and the place of presentation of stimuli. The shield 3 eliminates the possibility of simultaneous stimulation by a light stimulus presented from the outside and reflected in the mirror hood, and the round hole provides the possibility of observing the fixation object on the demonstration screen and the possibility of the presented light stimuli falling onto the mirror hood with their subsequent reflection and projection onto the retina eyes. The mirror hood is made in the form of a truncated pyramid, the side faces of which are flat mirrors facing inward with a mirror surface, oriented along the meridians of the field of view, set at angles that stimulate the peripheral areas of the field of view reflected in it by light stimuli presented from the outside (for example, on perimeter demo screen or computer display). Flat mirrors can be installed at different angles and separated by opaque and light-reflecting partitions, eliminating spurious reflections from neighboring flat mirrors to increase the reliability of the results of the examination of the peripheral areas of the field of view.

The housing is made with the possibility of replacing the lens to ensure the study of the peripheral field of view at various diopter values of the examined eye. The study is carried out as follows:

- the inventive lens with a diopter value corresponding to a deviation from the norm of the examined eye is installed in a standard holder for correction perimeter lenses or in a special holder for the campimeter;

- the patient is positioned so that his eye is on the optical axis of the perimeter (and accordingly the axis of the claimed device), and captures the eye on the fixation object presented, for example, on the demonstration screen of the perimeter or computer display, and the light stimuli presented on the invisible (closed from eyes with a shield) parts of the demonstration screen are corrected by the lens, reflected from the mirror hood and fall on the peripheral areas of the examined eye at angles necessary for examination, for example, from 40 to 90 (and more e) degrees;

- the patient's response to the presented stimuli is recorded and further interpreted by known methods.

Thus, using the proposed solution, reliable diagnosis of the entire region of the patient’s peripheral field of vision at all existing perimeters is possible, with correction of myopia and hyperopia. The claimed solution will provide a comfortable clear vision of the fixation object and a clear contrast projection of light stimuli on the retina in the peripheral areas.

In addition, the claimed solution extends the functionality of campimeters, allowing you to examine with their help not only the central, but also the peripheral region of the field of view.

Claims (4)

1. A correction lens for studying peripheral areas of the field of view, containing a lens in the mandrel, characterized in that it further comprises a housing for attaching the lens, a mirror hood mounted coaxially with the lens inside the housing and made in the form of a truncated pyramid, the side faces of which are flat mirrors turned inward by the mirror surface, as well as a shield installed in the housing with a round hole coaxial with the lens and mirror hood. 2. The device according to p. 1, characterized in that the housing is made with the possibility of replacing the lens. 3. The device according to claim 1, characterized in that the flat mirrors are installed at different angles. 4. The device according to p. 1 or 3, characterized in that the flat mirrors are separated by opaque and light-reflecting partitions, eliminating spurious reflections from neighboring flat mirrors.

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